Product Overview

• HI99121 Waterproof Portable pH-Temperature Meter [Soil & Agriculture]

• pH range: -2.00 to 16.00 pH; pH-mV conversion: ±825 mV; Temperature: -5.0 to 105.0°C; 23.0 to 221.0°F

• Specially designed for pH measurement and analysis of samples in agriculture/horticulture/soil industries

• Large LCD screen display allows you to easily view pH, pH-mV, temperature readings and instrument performance status from multiple angles; features a dedicated Sensor Check™ function that allows users to check electrode status at any time; built-in amplifier and temperature sensor conical glass pH electrode, new design, rugged and durable, compliant with IP67 waterproof standard (protection against dust and water immersion), portable two-button design, you can quickly perform setup and calibration modes, making the meter easier to operate

• New exterior design, extra-large dual-line screen display, user-friendly design, ergonomic, good value for money

• Setup and calibration information prompts, automatic two-point calibration recognition, built-in two sets of standard calibration points

• Two-button simple operation, 0.01 pH resolution, high-precision measurement, high cost-effectiveness

• Battery replacement is simple and quick, BEPS low battery error prevention system avoids incorrect measurements

• Designed for field measurement, excellent waterproof performance

• Recommended for pH measurement and analysis of samples in agriculture/horticulture/soil industries

Meter, HI1292D glass combination pH electrode with built-in temperature sensor, HI721319 dedicated soil auger, HI7051H soil sample preparation solution, Chinese and English instruction manual

• HI99121 is the perfect portable pH meter for soil testing. Using HI99121 and HI12923 direct soil pre-amplified pH and temperature probe, users can test soil pH directly or after preparing a soil slurry with deionized water.

• HI12923 features a conical, rugged tip that can be inserted directly into moist or soft soil. For harder soil, the kit includes a plastic auger for drilling into the ground.

• Automatic temperature compensation

• Automatic two-point calibration

• Waterproof

• Refillable

• Turn the cap to create positive pressure head, allowing more reference electrolyte to flow.

• Built-in temperature sensor

• Automatically compensates for temperature changes.

• Amplified electrode

• Fast, stable response, unaffected by humidity-induced electrical noise.

• Depending on the soil pH, soil can be acidic, neutral, or alkaline. Most plants prefer a pH range of 5.5 to 7.5; but some species prefer acidic or alkaline soil. However, each plant requires a specific pH range for optimal growth.

• pH strongly affects the availability of nutrients in the soil as well as the presence of microorganisms and plants. For example, fungi prefer acidic conditions, while most bacteria, especially those that provide nutrients to plants, prefer moderately acidic or slightly alkaline soil. In fact, under strongly acidic conditions, nitrogen fixation and mineralization of vegetable residues are reduced. Plants absorb nutrients dissolved in soil water, and the solubility of nutrients depends largely on pH. Therefore, the availability of elements varies at different pH levels.

• Each plant requires different amounts of elements, which is why each plant needs a specific pH range to optimize its growth. For example, iron, copper, and manganese are insoluble in alkaline environments. This means that plants requiring these elements should theoretically be in acidic soil. On the other hand, nitrogen, phosphorus, potassium, and sulfur are readily available in near-neutral pH ranges. In addition, abnormal pH values can increase toxic element concentrations in plants. For example, under acidic conditions, excessive aluminum ions may be present in amounts that plants cannot tolerate. When pH deviates too far from neutral conditions, it can also negatively affect chemical and physical structure (aggregate breakdown, lower permeability, denser soil).

• The HI99121 meter features a large multi-level LCD screen that simultaneously displays pH and temperature readings with a resolution of 0.01 pH and accuracy of ±0.02 pH. The LCD screen also features calibration status and stability indicators, as well as on-screen tutorial information. HI99121 has many advanced features found in more expensive portable instruments, including automatic calibration, buffer recognition, and temperature compensation. Battery percentage level is displayed at startup, reminding users of remaining available battery power. The supplied HI12923 is a glass body, amplified pH electrode with built-in temperature sensor, specifically designed for measuring pH in soil.

• Features at a glance

• Automatic temperature compensation

• One or two-point automatic calibration

• BEPS - alerts user to low battery levels, which may adversely affect readings

• Compact, durable, waterproof

• Battery percentage displayed at startup

• HELP function, displays messages on LCD

• Note: Use the soil auger on stony ground to prevent damage to the glass probe.

• For high accuracy and to ensure the soil is moist, use HI7051M soil preparation solution.